I've just installed leJOS and the Eclipse Plugin on my Windows 7 64 Bit PC (yes 32bit jdk is installed and eclipse is 32bit too)I've then tried to run the included samples and it worked fine to run them on the nxt

BUT

then i tried to run the pc samples and it said "Failed to open connection to the NXT" everytime and nothing happens...This is really problematic for me because the pc controlled programs are the only thing i can use for my planned program.

Thanks for the quick answer, but yes I have the fantom drivers installed and normal samples are working fine but the PC samples aren't working :/ (I did it exactly as it is described in the tutorial) it must have to do something with the 64 bit windows